"They are growing rapidly," one source says of VistaPrint in calling the firm "a great Massachusetts story." The need follows a 2006 lease of 165,000 sf at Two Ledgemont Center in Lexington now serving as the digital imaging company's headquarters. Aided by DTZ FHO Partners principals Joseph Fallon and Brian Hines, VistaPrint has reportedly been mulling options along Route 128 north from Waltham and up to the Sun Microsystems campus in Bedford.

Acquired last summer by Nordic Properties and the Nordblom Co. for $212 million, the 158-acre Sun campus has 800,000 sf of existing space and the ability to add another 570,000 sf, making it among a handful of parks in Greater Boston that could accommodate VistaPrint's super-sized needs. Nordblom officials and Hines were unavailable to discuss the rumors.

Citizens Bank has also been in an expansion mode of late, but observers could not determine whether the newest requirement reflects any net growth in occupancy. Although one source says the search has not been fully defined, it would supposedly unite offices in Norwood, Quincy and Westwood at a site somewhere between Quincy and Waltham. Richards Barry Joyce & Partners principals Michael Frisoli and Michael Joyce are representing Citizens, sources maintain. Frisoli directed questions to bank management, which did not respond by press deadline. By any measure, "it's huge," says one source familiar with the lease parameters.